@kiwidude
I am a trouble maker
It was funny that you used the exact Index as a date example ([2009.10] and I got that.
the other case was when I used [123] for the omnibus of 1 and 2 and 3
Another oddity I was using this as a test case: 2 titles (incorrectly) have the same (and Last) Index
Note: no number shows in Missing:
there are 5 books 1-4 (and 2 have a index of 4)